Revolver



F. T. MOORE May 24, 1932.

REVOLVER Filed Sept. 23. 1930 fm/entar Frederick T M flare. 2f. 1766!? 7A: 15 027235;:

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Patented May 24, 1932 ean FREDERICK T. MOORE, OF EAST HARTFORD,CONNECTICUT, ASSIGNOR TO COLTS PATENT FIREARMS MANUFACTURING 00., OFHARTFORD, CONNECTICUT, A CORPORATION OF CONNECTICUT REVOLVER Applicationfiled September 23, 1930. Serial No. 483,797.

With some types of ammunition commonly used in revolvers there is a shht swagmg action which takes place upon ring, when the bullet is forcedthrough the forward end of the cartridge chamber and into the barrel.

Frequently, the bullets are covered or sheathed with copper or othermetal and, as the result of the swaging action, fragments of thissheathing together with particles of lead are detached from the bulletsand are subjected to the action of the gasses of explosion. Some ofthese fragments or particles are forced outward through the narrow spacebetween the rear face of the barrel and the front face of the cylinder.In accordance with prior practice the front face of the cylinder hasbeen a single plane surface, and the result has been that some of theparticles thus discharged by the gases have been deposited on the saidsurface, the deposits taking the form of rings surrounding the severalchambers. This phenomenon is commonly known as leading, and it isobjectionable from the standpoint of appearance, and is furtherobjectionable in that it would, if allowed to continue sufficiently,eventually interfere with the rotation of the cylinder and hence withthe functioning of the revolver.

The object of the present invention is to provide a revolver soconstructed as to avoid relied upon for that purpose.

Of the drawings:

Fig. 1 is a side view of a revolver embodying the invention.

Fig. 2 is a detail view showing the front of the cylinder.

Fig. 3 is a fragmentary sectional view of the cylinder taken along theline 33 of Fig. 2 and also showing the rear end of the barrel.

Figs. 4 and 5 are views similar respectively to Figs. 2 and 3, butshowing an alternate embodiment ofthe invention.

Referring to the drawings, 1 represents the frame of the revolver, 2 thebarrel, 3 the rotatable cylinder, 4 the hammer and 5 the trigger. Ingeneral these parts maybe of any usual or preferred construction, and itwill be unnecessary to describe in detail any of the said parts otherthan the cylinder, as it is to the cylinder that my present inventionprimarily relates.

As shown clearly in Figs. 2 and 3, there are formed in the front face ofthe cylinder, annular grooves G surrounding the respective cartridgechambers 7 and spaced therefrom to leave very narrow annular surfaces 8immediately surrounding the said chambers. The external diameter of eachannular surface 8 is no'greater than the external diameter of the rearend portion of the barrel 2, and is preferably considerably smaller, asclearly shown in Fig. 3. The cylinder 3 is rotatable with respect to theframe 1 in the usual way so that during the normal firing of therevolver'the several chambers 7 are brought successively into registerwith the bore of the barrel. The mounting of the cylinder is such thatthe annular surfaces 8 come into very close proximity with the rear faceof the barrel, thusreducing to a minimum the space available for thegases of explosion to escapebetween the barrel and the cylinder. It willbe apparent that, while the surfaces 8 come into very close proximity tothe rear face of the barrel, the grooved portions'6 of the cylinder faceimmediately surrounding each surface 8 are in a different plane and areseparated from the plane of the rear face of the barrel.

The construction shown in Figs. 4 and 5 differs from that shown in Figs.2 and 3 solely in that the entire front face 6 of the cylinder, exceptfor the annular surfaces 8, is located in a plane at the rear of theplane of the said surfaces.

I have found that by providing only the very narrow annular surfaces 8in close proximity to the rear face of the barrel, I

deposits on the front of the cylinder. It is impossible to state withcertainty in what way my improved construction modifies the action ofthe gases so as to avoid the objec- 5 tionable leading; but I believethat the improved result is due to the fact that the radially movinggases are allowed to expand more quickly thus creating a turbulencewhich prevents the undesirable deposit of metal.

It will furthermore be observed, that'with my improved construction,even if a slight degree of leading should occur, it would be much lessobjectionable, as it would be in the grooves or on the offset surface 6where it could do no harm.

What I claim is:

1. A revolver havingat the extreme rear of the barrel an annularsubstantially fiat 320 face immediately surrounding the bore and havingat the'front of the cylinder narrow annular substantially flat surfacesimmediately surrounding the respective cartridge chambers, which lattersurfaces are of a diameter no greater than that of the aforesaid rearface of the barrel and'are adapted upon norm-a1 rotation of the cylinderto be successively positioned in register with and in close proximity tothe said rearface, the

"" portions ofthe frontface-of the cylinder immediately surrounding thesaid annular surfaces being at'a differentv plane so as to be separatedfrom thesaid rear face of: the barrel. 7

I 2. A revolver having at. the extreme rear of the barrel an annularsubstantially flat face immediately surrounding the bore 1 andehaving inthe front face of the cylinder'annular grooves surrounding'therespective cartridge '40 chambers and spaced therefrom to leave narrow,annular substantially fiat-surfacesimmediately surrounding thechambers,- which latter surfaces areof a diameter no greater than thatof the rear face of the barrelan'd are adapted upon normal rotationof-the cylinder to be successively positioned in register with and inclose proximity to the said rear face of the barrel.

In testimony whereof I have hereuntoset my hand this 11th 'day ofSeptember, 1930.

FREDERICK 2T. MOORE.

